Concrete joint form



April 8, 193%. P. JANNARONE CONCRETE JOINT FORM Filed June 18, 1929 2 Sheets-Sheet l P. JANNARONE April 8, 1930.

CONCRETE JOINT FORM Filed June 18. 1929 2 $heets-Sheet 2 Inventor Patented Apr. 8, 1930 UNITED STATES PETER JANNARONE, OF NUTLEY, NEW JERSEY CONCRETE JOINT FORM Application filed June 18, 1929. Serial No. 371,939.

This invention relates to a new joint form to be used in conjunction with all types of poured concrete construction where a mastic joint is required.

In accordance with the invention I have evolved and produced a structural arrangement' of parts which is particularly adaptable and advantageous for use in the construction of concrete roadways, pavements and the like, where the concrete is generally laid in sections and an expansion joint provided between the respective sections to compensate for expansion and constraction under variable weather conditions.

In carrying the invention into effect, I hav evolved and produced a simplified sectional structure which is characterized by economy, practicability in shape and construction of parts and other complemental features serving to produce a complete structural arrangement which is eflicient, susceptible of easy placement and removal, and otherwise capable of fulfilling the requirements of a structure of this class.'

Broadly, the invention has reference to the specific construction of the transverse expansion jointform, these being usable in conjunction with spaced parallel side forms or runners.

The particular details and association of parts will become more readily apparent from the following description and drawings.

In the drawings: 1

Figure 1 is a top plan view of one of the transverse expansion joint forms,- as constructed in connection with the invention, showing the employment of dowel pins.

Figure 2 is a cross sectional view through a special kind of a joint hereinafter described.

Figure 3 is a sectional view through a poured joint also to be hereinafter described.

Figure 4 is a sectional view showing the manner in which the laminated expansion joint form is arranged between abutting sections of concrete, and how it is associated with the embedded dowel pins.

Figure 5 is a transverse section taken approximately upon the plane of the line 5-5 of Figure 1.

Figure 6 is a perspective view of one of the sections of the central spacer.

Figure 7 is a perspective view of one form of cap.

Figure 8 is a perspective View of a different embodiment of cap.

Figure 9 is a perspective view of still another embodiment of cap.

Figure 10 is a perspective view of one end portion of one of the sectlons of the facing plate for the dowel pin construction.

Figure 11 is a perspective view of one end portion of one .of the sections of the central spacer for dowel pin construction. 7

Briefly stated, the gist of the invention is found in the provision of a laminated expansion joint form which is composed of a central spacer of sectional construction, together with a pair of complemental cover or facing plates. The spacer is composed of a plurality of sections disposed in abutting end to end relation according to the width of the work. In addition, the assembly includes a suitable crown or cap which embraces the upper edge portions of the spacer and spacing plates and holds them in assembled relation ship.

Attention is first invited to Figure 4, wherein itwill be observed that 11 designates one section of poured concrete, still in plastic form, and 12 the complemental or abutting section. In this particular arrangement, I

employ two distinct groups of dowel pins 13 which bridge the joint and are allowed to remain anchored in the concrete. As seen here the central spacer is designated generally at 14, one facing plate 15, and the remaining facing plate at 16. The cap 17 is of channel shaped cross section and fits down over this 55 strument or implementof appropriate form 'In this arrangement, -I provide two distinguishable groups of dowel pins 13. There are three pins in each groupand these are disposed in longitudinally spaced relationship with respect to each other. As here shown,

the center spacer is composed of three companion sections; namely, an intermediate solid plate section .14 (see Fig. 6) disposed between the adjacent ends of the companion sections 14 and 14 res ectively.

The adjacent ends of these three sections are formed with projections 19 which abut each other as represented in dotted lines in Figure 2, thus forming spaces between the adjacent ends of the sections. The section 14" is without notches, while the sections 14 and 14 are formed with substantially L-shaped notches. The horizontal portions of the notches in the left-hand section 14 (Figure 2) are disposed in a direction toward coresponding portions of the notches in the section 14".

The dowel pins 13 are located in the terminal portion of these notches 18 as shown in the drawings. In a sense, the plate section 14 constitutes a retainer for maintaining the two end sections 14 and 14 in the position represented in Figure 2.

The outside or facing plates 15 and 16 are disposed alongside of the three distinguishable sections of the spacer and these plates 15 and 16 are formed with vertical notches 16 which receive the projecting end portions of the dowel pins 13 and which are out of aline: ment with the vertical portions of the notches 18 in the assembled relationship of parts shown in Figure 2. Placing the channel shaped cap 17 over the upper edge portions of the facing plates serves to bind them against the spacer sections and to maintain illiedcomplete structure appropriately assem- If necessary to cover the notches of the spacing plates, a multi-ply tar paper maybe used to prevent the concrete mixture from entering the notched portions of these plates.

To remove the oint form after the concrete mixture has become set with sufiicient rigidity the following procedure will be found satisfactory. First, lift oil the cap 17. This will then expose the complemental projections 19 on the spacer sections. Then an inis inserted between the ends of the sections 14", 14 and 14, and hooked underneath the projections 19. In this way, the central section 14 can be lifted out. Thenthe two end sections 14 and 14 can be slipped over; that is, away from the side forms 20 or in a direction toward each other. e

These sections 14 and 14 are slipped over sufiiciently far to cause the vertical portions of the notches 18 to aline with the dowel pins 13 and the vertical slots 16*, after which the 3 sections may be lifted out. With the spacer sections removed, it'is an easy matter to lift out the facing plates, thus leaving the reinforcing dowel pins 13 embedded in the concrete and bridging the joint.

These are here shown as provided with struck out keepers or guides 21, in which anchoring stakes or pins 22 are arranged as shown.

As shown in Figure 3, the reference character 23 designates a completed section of the concrete which is hardened and 24 designates the complementa-l section which is still in the plastic form. Here the expansion joint form is not constructed to accommodate dowel pins. The reference character 25 designates a solid or imperforate spacer and 26 and 27 complemental facing plates. In

this particular arrangement, I provide the L-shaped cap 28 whose horizontal flange overlies the finished section 23. This facilitates the removal of the ca and subsequent removal of the parts 0 the expansion joint form.

Under some conditions, it is advisable to employ the type of cap seen in Figure 9, wherein it will be observed that the same comprises a short flange 29, a web 30 and a relatively long flange 31,-which functions as one of the facing plates of the complete form.

It isunderstood that in accordance with the invention, the plates which constitute the assembly of the expansion joint form are made of sturdy steel of appropriate thickness, according to the joint re uired. The height and width will be variab e according to the necessary width of the joint.

It is thought that by considering the description in conjunction with the drawings, the reader will be able to obtain a clear understanding of the construction, the assembly and the features and advantages of the improved construction.

Therefore, a more lengthly description is believed to be unnecessary.

Minor changes in the shape, size, materials andrearrangement of features coming. within the field of invention claimed may be resorted to, in actual practice, if desired.

I claim:

1. Inan expansion joint form of the class I described, a laminated structure comprising a central spacer composed of sections provided with end projections to facilitate lifting of the sections from the concreteand further provided with substantially L-shaped notches whose vertical portionsopen through the lower edges of said sections, facing plates on opposite sides of said spacer and provided with notches for cooperation with said L- shaped notches, and a crown cap embracing said facing plates and spacer to maintain the parts in assembled relation.

2. An expansion joint form. comprising an intermediate spacer composed of a plurality of individual detachably connected sections formed With substantially l.-shaped dowel pin notches, outside facing plates disposed on opposite sides of said spacer and provided With vertical notches opening through the lower edges of said plates, and a removable cap fitting over the upper edges of the facing plates as Well as said spacer section.

In testimony whereof I aflix my signature.

PETER JANNARONE. 

